This document discusses the development of self-repairing concrete. The technique involves embedding repair materials inside hollow ducts within the concrete before damage occurs. When cracks form, the materials are released from the ducts and penetrate the cracks to repair the damage. The methodology involves laying hollow polyurethane ducts filled with epoxy and hardener along the tension side of a concrete beam. When cracks form under loading, the chemicals mix and seal the cracks. Testing showed the chemicals were successfully released and filled cracks, increasing the beam's strength. This self-repairing approach addresses bonding and durability issues compared to other repair methods.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
STUDY OF THE EFFECT OF NANO SILICA ON THE SELF HEALING ABILITY OF HIGH STRENG...IAEME Publication
The aim of this study is analyzing the self-healing capability of high strength concrete (M70) with nano silica and crystalline admixture in three types of environmental exposures i.e. water immersion, wet/dry cycles and water contact. The percentage replacements of cement with nano silica were 1%, 2%, 3% with addition of 1.1% crystalline admixture. The specimens were pre-cracked at 28 days in the range of 0.10-0.40mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength regaining capacity for all exposure conditions. The concrete with 2% nano silica and 1.1% crystalline admixture (CA) has complete crack closing ability and strength regaining capacity for water immersion and wet/dry cycle conditions.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
STUDY OF THE EFFECT OF NANO SILICA ON THE SELF HEALING ABILITY OF HIGH STRENG...IAEME Publication
The aim of this study is analyzing the self-healing capability of high strength concrete (M70) with nano silica and crystalline admixture in three types of environmental exposures i.e. water immersion, wet/dry cycles and water contact. The percentage replacements of cement with nano silica were 1%, 2%, 3% with addition of 1.1% crystalline admixture. The specimens were pre-cracked at 28 days in the range of 0.10-0.40mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength regaining capacity for all exposure conditions. The concrete with 2% nano silica and 1.1% crystalline admixture (CA) has complete crack closing ability and strength regaining capacity for water immersion and wet/dry cycle conditions.
Self-compacting concrete is high performance concrete which is highly flowable, non-segregating, spread on its
own weight and doesn‟t need any compaction. This paper deals with flow and strength characteristics such as
compressive strength, split tensile strength, flexural strength and impact strength of Self-compacting concrete
with various percentages of waste plastic fibres like 0%, 0.25%, 0.5%, 0.75%, 1.0%, 1.1%, 1.20%, 1.3% and
1.4% is added by weight of cement. The mix proportion for M40 grade of concrete was done by using Nan Su
method (Cement: GGBS: Fine aggregate: Course aggregate 1: 0.705: 3.34: 2.62). Water powder (W/P) ratio
0.36, cement content 280kg/m3
, GGBS 220 kg/m3 was calculated and maintained as constant throughout the
experimental work for all eight mixes, only the superplastizers dosage was varied for different percentage of
fibres. In this experimental investigation one control mix and eight (8) different mixes were considered. Totally
81 Cube, beam, Cylindrical specimens and square plates were casted, cured and tested as per IS specifications.
For determining impact strength drop weight method was used. The results obtained indicate that fresh
(workability) characteristics satisfy the lower and upper limit as suggested by EFNARC. The tests on hardened
properties indicate that the compressive strength, split tensile strength, flexural strength was improved
proportionally with the addition of waste plastic fibers upto 1.0% by weight of cement and then decreases. The
impact strength improved proportionally with addition of fibres upto 1.2% by weight of cement and then
decreases
Concrete is a composite material used on the grounds that all considerate designing structures are developed with
concrete. This report accentuation that by utilizing locally accessible materials like jaggery, may enhance the properties of
concrete. The experiment has been completed for assessing the quality properties of concrete utilizing Jaggery as admixtures
into the concrete creation. Normally these sorts of admixtures utilized as a part of the extraordinary cases like huge wharfs
and long heaps. Four unique rates of admixtures (Jaggery) are picked in the experimentation as, 0.1%, 0.2%, 0.3%and 0.4%
by weight of cement with M20 and M25 grade, mix design of concrete. At last, it was presumed that workability and
compressive strength of concrete upgraded when admixtures Jaggery included into the concrete synthesis.
Evaluation of Compressive Strength and Water Absorption of Styrene Butadiene...IJMER
In this research, effect of Styrene-Butadiene Rubber (SBR) latex on water absorption and
compressive strength of concrete has been studied. A locally available “RIPSTAR-148” is used as SBR
Latex.
It has been observed that SBR latex improves the internal structure of the latex modified
concrete resulting in considerable reduction in the water absorption value at 28 days of age. However,
at early age, the effect of SBR latex on water absorption is adverse. Same trend is noticed for the
compressive strength; at 7 days of age, SBR latex has negative effect while at 28 days, the addition of
SBR latex in concrete results in enhancement of compressive strength. Based on the results of this
study, latex modified concrete made using “RIPSTAR-148” may be recommended to be used in RC
structures in INDIA. However, for the mixes rich in cement, the dosage of “RIPSTAR-148” needs to be
adjusted to maintain required workability of concrete.
Experimental study on flexible concrete by using polyurethane fiberijtsrd
In this paper the properties of conventional concrete have been developed. Conventional concrete has the property of high brittleness and less flexural strength. This is a undesirable characteristics is mother of development of Flexible concrete to improve this deficiency. The Polyurethane fiber has the ability to impart considerably flexibility in concrete. For this purpose concrete cube, cylinders and beams experimentally tested. By the mixture of traditional concrete ingredients and special polyurethane fibers addition with water super plasticizers for good workability purpose. The test results have proved to be increased flexibility of the concrete. Dinesh W. Gawatre | Ajay G. Gaund | Dipali S. Dhondge | Amol U. Gandhale | Shubham Fartade"Experimental study on flexible concrete by using polyurethane fiber" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14158.pdf http://www.ijtsrd.com/engineering/civil-engineering/14158/experimental-study-on-flexible-concrete-by-using-polyurethane-fiber/dinesh-w-gawatre
Comparitive study on Improvement on the Concrete Cracks by using Bacillus Pas...ijsrd.com
Cracks are one of the naturally weaknesses of concrete and they are irreversible. Bacillus Sphaericus and Bacillus Pastuerii are common soil bacterium induce the precipitation of calcite exhibited its positive potential in selectively consolidating simulated fractures in the consolidation of sand. A comparative study on effect of crack repair by different bacteria on compression, flexural and durability tested on mortar cubes and concrete beams. The effect of different depth of crack on the compression, flexural and durability of concrete was studied. It was found that all the increase in depth of crack reduce the strength of cubes and beams.
Comparative Study of Mechanical Properties of Self - Healing Concrete Using I...IJERA Editor
Cracks in concrete are the main reason for a decreased service life of concrete structures. It is therefore more
advisable and economical to restrict the development of early age small cracks the moment they appear, than to
repair them after they have developed to large cracks. A promising way is to pre-add healing agents (Methyl
methacrylate) to the concrete to heal early age cracks when they appear, i.e. the so-called self-healing approach.
By this approach, Methyl methacrylate was used as self – healing agent and its self-healing capability was
confirmed by UPV test. In that self – healing concrete, Industrial Waste Steel Scrap and Polyethylene fiber were
added to evaluate its mechanical properties. The experimental results shown that the self – healing concrete
can yield high compressive strength when Polyethylene fiber was added and also yield high tensile strength by
adding Industrial waste steel scrap. Also, it is found to be economical by adding steel scrap in self – healing
concrete instead of steel fiber.
Experimental Study on Composite Concrete RC Frame Structure using Sisal Fibreijtsrd
This project aims to compare the mechanical properties of Sisal fiber in the improvement of load carrying capacity of concrete structure in different layers. Beams and columns may be strengthened in flexure through the use of sisal fiber bonded to their tension zone using epoxy as a common adhesive. Due to several advantages of sisal fibre wrapping over conventional techniques used for structural repair and strengthening. In our project is study about load carrying capacity of an RCC frame wrapped with sisal fiber. An experimental study is to predict the maximum load carrying capacity, deflection of the composite RCC structure. Finally the results are compared with conventional framed structure, which is suitable for strength and rehabilitate the concrete structure. P. Vanmathi | A. Dharani "Experimental Study on Composite Concrete RC Frame Structure using Sisal Fibre" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-4 , June 2020, URL: https://www.ijtsrd.com/papers/ijtsrd31115.pdf Paper Url :https://www.ijtsrd.com/engineering/structural-engineering/31115/experimental-study-on-composite-concrete-rc-frame-structure-using-sisal-fibre/p-vanmathi
AN EXPERIMENTAL STUDY ON STRENGTH AND FRACTURE PROPERTIES OF SELF HEALING CON...IAEME Publication
Cracking in concrete is irresistible when the load applied is more than its limit and the treatment of cracks is very expensive. This phenomenon also affects the reinforcement in the structure by means of carbon dioxide and water through the cracks. One of the ways to arrest this cracking phenomenon is mixing of bacteria into the concrete. In the present study, an attempt is made to arrest the cracks in concrete using bacteria and calcium lactate. The percentages of bacteria selected for the study are 3.5% and 5% by weight of cement. In addition, calcium lactate was used at 5% and 10% replacement of cement by weight. Bacteria produce calcium carbonate crystals which blocks the micro cracks and pores in the concrete after reacting with calcium lactate.
Self-compacting concrete is high performance concrete which is highly flowable, non-segregating, spread on its
own weight and doesn‟t need any compaction. This paper deals with flow and strength characteristics such as
compressive strength, split tensile strength, flexural strength and impact strength of Self-compacting concrete
with various percentages of waste plastic fibres like 0%, 0.25%, 0.5%, 0.75%, 1.0%, 1.1%, 1.20%, 1.3% and
1.4% is added by weight of cement. The mix proportion for M40 grade of concrete was done by using Nan Su
method (Cement: GGBS: Fine aggregate: Course aggregate 1: 0.705: 3.34: 2.62). Water powder (W/P) ratio
0.36, cement content 280kg/m3
, GGBS 220 kg/m3 was calculated and maintained as constant throughout the
experimental work for all eight mixes, only the superplastizers dosage was varied for different percentage of
fibres. In this experimental investigation one control mix and eight (8) different mixes were considered. Totally
81 Cube, beam, Cylindrical specimens and square plates were casted, cured and tested as per IS specifications.
For determining impact strength drop weight method was used. The results obtained indicate that fresh
(workability) characteristics satisfy the lower and upper limit as suggested by EFNARC. The tests on hardened
properties indicate that the compressive strength, split tensile strength, flexural strength was improved
proportionally with the addition of waste plastic fibers upto 1.0% by weight of cement and then decreases. The
impact strength improved proportionally with addition of fibres upto 1.2% by weight of cement and then
decreases
Concrete is a composite material used on the grounds that all considerate designing structures are developed with
concrete. This report accentuation that by utilizing locally accessible materials like jaggery, may enhance the properties of
concrete. The experiment has been completed for assessing the quality properties of concrete utilizing Jaggery as admixtures
into the concrete creation. Normally these sorts of admixtures utilized as a part of the extraordinary cases like huge wharfs
and long heaps. Four unique rates of admixtures (Jaggery) are picked in the experimentation as, 0.1%, 0.2%, 0.3%and 0.4%
by weight of cement with M20 and M25 grade, mix design of concrete. At last, it was presumed that workability and
compressive strength of concrete upgraded when admixtures Jaggery included into the concrete synthesis.
Evaluation of Compressive Strength and Water Absorption of Styrene Butadiene...IJMER
In this research, effect of Styrene-Butadiene Rubber (SBR) latex on water absorption and
compressive strength of concrete has been studied. A locally available “RIPSTAR-148” is used as SBR
Latex.
It has been observed that SBR latex improves the internal structure of the latex modified
concrete resulting in considerable reduction in the water absorption value at 28 days of age. However,
at early age, the effect of SBR latex on water absorption is adverse. Same trend is noticed for the
compressive strength; at 7 days of age, SBR latex has negative effect while at 28 days, the addition of
SBR latex in concrete results in enhancement of compressive strength. Based on the results of this
study, latex modified concrete made using “RIPSTAR-148” may be recommended to be used in RC
structures in INDIA. However, for the mixes rich in cement, the dosage of “RIPSTAR-148” needs to be
adjusted to maintain required workability of concrete.
Experimental study on flexible concrete by using polyurethane fiberijtsrd
In this paper the properties of conventional concrete have been developed. Conventional concrete has the property of high brittleness and less flexural strength. This is a undesirable characteristics is mother of development of Flexible concrete to improve this deficiency. The Polyurethane fiber has the ability to impart considerably flexibility in concrete. For this purpose concrete cube, cylinders and beams experimentally tested. By the mixture of traditional concrete ingredients and special polyurethane fibers addition with water super plasticizers for good workability purpose. The test results have proved to be increased flexibility of the concrete. Dinesh W. Gawatre | Ajay G. Gaund | Dipali S. Dhondge | Amol U. Gandhale | Shubham Fartade"Experimental study on flexible concrete by using polyurethane fiber" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14158.pdf http://www.ijtsrd.com/engineering/civil-engineering/14158/experimental-study-on-flexible-concrete-by-using-polyurethane-fiber/dinesh-w-gawatre
Comparitive study on Improvement on the Concrete Cracks by using Bacillus Pas...ijsrd.com
Cracks are one of the naturally weaknesses of concrete and they are irreversible. Bacillus Sphaericus and Bacillus Pastuerii are common soil bacterium induce the precipitation of calcite exhibited its positive potential in selectively consolidating simulated fractures in the consolidation of sand. A comparative study on effect of crack repair by different bacteria on compression, flexural and durability tested on mortar cubes and concrete beams. The effect of different depth of crack on the compression, flexural and durability of concrete was studied. It was found that all the increase in depth of crack reduce the strength of cubes and beams.
Comparative Study of Mechanical Properties of Self - Healing Concrete Using I...IJERA Editor
Cracks in concrete are the main reason for a decreased service life of concrete structures. It is therefore more
advisable and economical to restrict the development of early age small cracks the moment they appear, than to
repair them after they have developed to large cracks. A promising way is to pre-add healing agents (Methyl
methacrylate) to the concrete to heal early age cracks when they appear, i.e. the so-called self-healing approach.
By this approach, Methyl methacrylate was used as self – healing agent and its self-healing capability was
confirmed by UPV test. In that self – healing concrete, Industrial Waste Steel Scrap and Polyethylene fiber were
added to evaluate its mechanical properties. The experimental results shown that the self – healing concrete
can yield high compressive strength when Polyethylene fiber was added and also yield high tensile strength by
adding Industrial waste steel scrap. Also, it is found to be economical by adding steel scrap in self – healing
concrete instead of steel fiber.
Experimental Study on Composite Concrete RC Frame Structure using Sisal Fibreijtsrd
This project aims to compare the mechanical properties of Sisal fiber in the improvement of load carrying capacity of concrete structure in different layers. Beams and columns may be strengthened in flexure through the use of sisal fiber bonded to their tension zone using epoxy as a common adhesive. Due to several advantages of sisal fibre wrapping over conventional techniques used for structural repair and strengthening. In our project is study about load carrying capacity of an RCC frame wrapped with sisal fiber. An experimental study is to predict the maximum load carrying capacity, deflection of the composite RCC structure. Finally the results are compared with conventional framed structure, which is suitable for strength and rehabilitate the concrete structure. P. Vanmathi | A. Dharani "Experimental Study on Composite Concrete RC Frame Structure using Sisal Fibre" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-4 , June 2020, URL: https://www.ijtsrd.com/papers/ijtsrd31115.pdf Paper Url :https://www.ijtsrd.com/engineering/structural-engineering/31115/experimental-study-on-composite-concrete-rc-frame-structure-using-sisal-fibre/p-vanmathi
AN EXPERIMENTAL STUDY ON STRENGTH AND FRACTURE PROPERTIES OF SELF HEALING CON...IAEME Publication
Cracking in concrete is irresistible when the load applied is more than its limit and the treatment of cracks is very expensive. This phenomenon also affects the reinforcement in the structure by means of carbon dioxide and water through the cracks. One of the ways to arrest this cracking phenomenon is mixing of bacteria into the concrete. In the present study, an attempt is made to arrest the cracks in concrete using bacteria and calcium lactate. The percentages of bacteria selected for the study are 3.5% and 5% by weight of cement. In addition, calcium lactate was used at 5% and 10% replacement of cement by weight. Bacteria produce calcium carbonate crystals which blocks the micro cracks and pores in the concrete after reacting with calcium lactate.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
In this PPT you know about the SELF HEALING technology in spacecrafts
This technology is still under research in NASA.
This technology can be also implement on Aircrafts.So it is very simple concept it includes some basic knowledge about Composites materials and its properties.
The present case sudy is about the upcoming marine structures and methods to deal with the deterioration of structures with the help of bacterial injection in concrete.
Self healing matrix formed by the bacteria excreates calcium components to heal concrete
The concept of an autonomic self-healing material, where initiation of repair is integral to the material, is now being considered for engineering applications. This bio-inspired concept offers the designer an ability to incorporate secondary functional materials capable of counteracting service degradation whilst still achieving the primary, usually structural, requirement. Most materials in nature are themselves self-healing composite materials. This paper reviews the various self-healing technologies currently being developed for fiber reinforced polymeric composite materials, most of which are bioinspired; inspired by observation of nature. The most recent self-healing work has attempted to mimic natural healing using more detailed study of natural processes. A perspective on current and future self-healing approaches using this biomimetic technique is offered. The intention is to stimulate debate and reinforce the importance of a multidisciplinary approach in this exciting field.
Retrofitting of RCC structural members is necessary to prevent further distress in concrete. Retrofitting of RCC members should start with investigation and diagnosis of cracks and then by applying suitable retrofitting measures.
Self Healing Capabilities in Polymeric Materials An Introduction to Techniquesijtsrd
Polymeric materials had shown tremendous increment in its properties due to its acceptability in a wide range of engineering usage. The usage is still restricted due to its reparability and life then after. The life of repaired plastic is less. The present paper study of various type of techniques available, which can develop self healing capabilities in polymeric materials. The main aim is to further concentrate on an idea which gives maximum improvement in engineering properties, life etc. for structural and engineering usage. Avinash Pratap Singh | Kuldeep Singh | Aman Jain | Arun Kapoor | Ankit Kumar | Abhishek Pandey ""Self-Healing Capabilities in Polymeric Materials: An Introduction to Techniques"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23886.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23886/self-healing-capabilities-in-polymeric-materials-an-introduction-to-techniques/avinash-pratap-singh
EXPERIMENTAL INVESTIGATION OF SELF COMPACTING CONCRETE BY VARYING PERCENTAGE ...Ijripublishers Ijri
Self-compacting concrete was first developed 1988 in order to achieve durable concrete structures. Since then, various
investigations have been carried out and the concrete has been used in practical structures in Japan, mainly by large
construction companies. Investigations for establishing a rational mix-design method and self-compactability testing
methods have been carried out to make the concrete the standard one.
This project is study of Self-healing behaviour of concrete which deals with
mechanical properties of concrete is widely used to improve the durability of the
concrete. Self-healing concrete is a product that will chemically produce hydrates to
heal the cracks that appear on the surface of concrete structures. In self-healing
process healing agent absorbs the moisture content present in atmosphere to heal.
This process enhanced mechanical properties of concrete. Superabsorbent polymers
(SAPs) are materials that have the ability to absorb and retain large volumes of water
and aqueous solutions. SAP is now a mature product that has quickly progressed from
specialty chemical to special commodity. Sodium silicate is used as SAP chemical
admixtures as well as self-healing agent for concrete. Sodium silicate in liquid form at
2% is mixed with concrete based on previous work. As per IS 10262 : 2009, M40
grade concrete mix design is derived for both control and SAP concrete and
specimens are prepared for compressive strength, split tensile strength and flexural
strength. At age of 7, 14, and 28 and 56 days, tests are conducted to determine the
compressive, split tensile and flexural strengths. The specimen are also pre-cracked
on 28th day and re-cured for 28 days to undergo rapid self-healing process. On 56th
day, they are tested for determining the recovery of strengths. The effect of 2%
sodium silicate on the strength and the healing property of concrete is studied by
determining the self-healing efficiency.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
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Free Complete Python - A step towards Data Science
A04940105
1. IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org
ISSN (e): 2250-3021, ISSN (p): 2278-8719
Vol. 04, Issue 09 (September. 2014), ||V4|| PP 01-05
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Development of Self Repairable Concrete System Sahebrao.G.Kadam, Dr. M.A.Chakrabarti (Department of structural engineering, VJTI, Mumbai, India) Abstract: - During the serviceability of structure concrete is subjected to different damages. The common approach for repair of Structural concrete are: Polymer Injunction, External prestressing, Geomembranes and Polymer wraps. The above technique is based on addition of a repair material to concrete from outside to inside of structural members. Now we are going to develop the self-repairing concrete by adding the materials from inside the concrete to repair. Our technique to develop self-repairing concrete consists of embedding repairing materials in hollow ducts in the repairing zone before it is subjected to damage. Therefore when cracks occurs this repairs materials will get released from inside and it will enter the repairing zone. Where it will penetrate into cracks and rebound to mother material of Structure and it will repair the damage. Keywords: - Concrete – Serviceability – Cracks - Epoxy resins - Repairs.
I. INTRODUCTION
In Structural Engineering concrete is basic material used in R.C.C & Prestressed concrete. Our technique is to develop self-repairing concrete consists of embedding repairing materials in hollow ducts in the repairing zone before it is subjected to damage or crack. Therefore when cracks occurs this repairs materials will released from inside duct and it will enter the repairing zone. Where it will penetrate into cracks and rebound to mother material of structure. The cracking and damages are associated with low tensile strain capacity of concrete, get repaired with our chemical present inside. Thus we repair the problem where it occurs and just in time automatically without material intervention. Long term durability can be achieved by dimensional stability which means less stress from thermal contraction, autogenously shrinkage and drying shrinkage. Hence technique we utilized does precisely that it adds more materials to the concrete repair zone from inside upon demand when it is triggered by events such as cracking. Our approach consists to address the bonding problem of repair material from inside the concrete therefore definitely better technique compared to other methods. It is seen that self-repairing performs better because the resin is flexible itself and keep on releasing the each brittle failure that is cracks. The ability to fill in for dimensional gaps has been shown to work with self- repairing resins that grow larger in volume. The internal released stiff resins are less brittle, more ductile and stronger in tension as compare to concrete. This type of technique is useful for structural member subjected to bending, shear cracks, etc. This approach of self-repairing is useful for bridges having pre-stressed box girders where dynamics, moving loads cyclic loads are in huge quantity and development of minor to major cracks possibility is more. Hence our approach consist of embedding repair material in hollow ducts in cracking or tension zone before it subjected to damage. Therefore when cracking occurs, this repair material is released from inside the brittle tubes and enters in damage zone/area, where it penetrates into cracks and rebounds to the mother material of structure and structure being repair.
II. BACKGROUND OF THE RESEARCH
In literature survey last 20 years different research has develop the self-repairing techniques in different country under different climatic conditions, assumptions, and materials, etc. Out of which Dr. Carolyn Dry from USA has developed the practical technique of Development of self-repairing durable concrete [1]. In his work investigation was made into development of transparent polymer matrix composites that have the ability to self-repair internal cracks due to Mechanical loading. In his work focused on cracking of hollow Repair fibers disposed in a matrix and subsequent release of repair chemicals in order to visually assess the repair and speed of repairs in the impact test the polymer specimen was released in ten seconds. Similarly, Mihashi and Yoshio proposed incorporating glass pipes containing the repairing agent into the concrete for self-healing capabilities to restore strength and for the prevention of water leakage [2]. This concept was also utilized by Li et al. who incorporated hollow glass fibers containing ethyl cyanoacrylate, a thermoplastic monomer, into the mix [3]. This filled hollow-fiber method has been successful in other concrete systems as well as reinforced polymers and epoxies [4-10], but limitations such as a lack of ease
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in manufacturing have made these products undesirable for commercial use. Sottos et al. have developed a polymer composite system that incorporates a catalyst into the polymer matrix phase with a microencapsulated repair agent [11]. The healing agent is released upon crack propagation through the microcapsule, resulting in as much as an 80% recovery of toughness after a fracture. This method has been successfully demonstrated in various polymer composite systems [12-14].
III. PROPERTIES OF MATERIAL
In development of self-repairable concrete system main component i.e. resin and hardener were selected such that, it will get mixed together after formation of crack and will get set within crack with addition of sealing it. Some criteria for the selection of resin considered are, a) The material should be able to repair different types and sizes of damages. b) It should be economically viable. c) It should be easily available in market. d) While using the chemical it should not cause hazardous effects. e) It should establish good quality assurance and reduce life cycle cost. f) It should withstand different forces and dynamic loads. g) It should have satisfactory properties like compressive strength, viscosity and pH. pH value is such that it will not cause any corrosion to the reinforcement. Viscosity of both the chemical shall be such that it will seal the minor cracks like shrinkage or temperature cracks. Working temperature of both the solution shall be wide. Void former of polyurethane selected so that it can be easily removed from concrete specimen as there is no friction between surfaces. This void former material is elastic and easily available in various diameters.
Void Former (Polyurethane Material) Fig. 1 1.0 Research Methodology The methodology is mainly designed for flexural member and for crack formation within that member due different loadings. To carry out one point flexural test a concrete specimen of 300mm x 70mm x 1000mm with 6mm dia. mild steel bars is such selected do that it will be a flexural member with sufficient width so that matrix of hollow ducts can be laid along it on the tension side of section. In the initial stage of testing we have provided ducts along the length of member with the help of polyurethane material of 6mm diameter. This Ducts then alternately filled with epoxy solution and hardener. Idea behind is when crack formation under loading will take place this two solutions will get mixed with each other forming hard compound together which will sealed the crack.
Arrangement of Void Former in Slab Fig. 2
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Slab specimen after removal of shutter with hollow duct to fill with resin Fig. 3
Slab specimen under one point flexural loading system (Ducts filled with resins) Fig. 4
Soffit of slab after loading and crack formation Resin is released from voids through cracks Fig. 5
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Soffit of slab after repair with chemical Cracks filled with resin
Fig. 6 2.0 Results and Conclusion: One point flexural test was carried out on the specimen after 28 days of curing by feeling the resins. Load is gradually added till resin gets released through the cracks. Same test was again carried out after 7 days to ensure the curing with resins. Graph showing load vs. deflection of specimen.
IV. IMPORTANT OBSERVATIONS
- In case of first test chemical visible on surface for load of around 550 kg and in case of second test chemical getting released for load of around 750 kg. - Theoretical value of load for crack formation matches with the experimental value. - Chemical is getting released through the cracks in desired way. - Crack getting filled with the solution in proper manner. - Crack getting sealed properly where there is proper mixing of resin and hardener. - Amount of hardener and profile of ducts causes variation in reaction time of both solutions. - As both solutions were kept separated, it will ensure automatic repairing system of concrete. - After reaction of Resins and hardener the cemented material is formed equivalent to mother concrete. After air curing of said cemented material the strength of flexural member is increased more than 10%, etc. Hence it is concluded that by this system allowing with the seal of crack strength of the member is also increased. REFERENCES
[1] Dr. Carolyn Dry Has Carried Out Lot Of Work On Development Of Self Repairing Durable Concrete. Natural Process Design, Inc. Winona, Minnesota (507-452-9113).
[2] Mihashi, H. and Y. Kaneko, Intelligent concrete with self-healing capability. Transactions of the Materials Research Society of Japan, 2000. 25(2): p. 557-560.
[3] Li, V.C., Y.M. Lim, and Y.-W. Chan, Feasibility study of a passive smart self-healing cementitious composite. Composites Part B, 1998. 29B: p. 819-827.
[4] Pang, J.W.C. and I.P. Bond, A hollow fibre reinforced polymer composite ecompassing self- healing and enhanced damage visibility. composites Science and Technology, 2005. 65: p.1791-1799.
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[5] Dry, C.M., Alteration of matrix permeability and associated pore and crack structure by timed release of internal chemicals. Ceramic Transactions, 1991: p. 191-193.
[6] Dry, C.M., Passive tunable fibers matrices. International Journal of Modern Physics, 1992. 6: p. 2763-2771.
[7] Dry, C.M. Smart building materials which prevent damage or repair themselves. In Proceedings of the Materials Research Society Symposium. 1992. California: Materials Research Society.
[8] Dry, C.M. Smart materials which sense, activate and repair damage; hollow porous fibers in
composites release chemicals from fibers for self- healing, damage prevention, and/or dynamic control. in First European conference on smart structures and materials. 1992. Glasgow, Scotland.
[9] Williams, G., R. Trask, and I.P. Bond, A self- healing carbon fibre reinforced polymer for aerospace applications. Composites Part A, 2007. 38(1525-1532).
[10] Williams, G., R. Trask, and I.P. Bond, Bioinspired self-healing of advanced composite strcutres using glass fibres. Journal of the Royal Society Interface, 2007. 4: p. 363-371.
[11] Sottos, N.R., M.R. Kessler, and S.R. White, Self- healing structural composite materials. Composites Part A: Applied Science and Manufacturing, 2004. 34(8): p. 743-753.
[12] Yin Tao, e.a., Self-healing woven glass fabric/epoxy composites with the healant consisting of micro-encapsulated epoxy and latent curing agent. Smart Material Structures, 2008. 17: p. 15-19.
[13] Brown, E.N., N.R. Sottos, and S.R. White,Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite- Part II: In situ self-healing Composites Science and Technology, 2005. 65(15-16): p. 2474-2480.
[14] Yin, T., et al., Self-healing epoxy composites- Preparation and effect of the healant consisting of microencapsulated epoxy and latent curing agent. Composites Science and Technology 2007. 67(2): p. 201-212.